private void EmitUsingDefinitionValue(ILGenerator ilGenerator, FluentActionDefinition fluentActionDefinition, FluentActionUsingDefinition usingDefinition, Dictionary <int, int> methodParameterIndices, StateMachineState state, int stateIndex, int handlerInStateIndex)
{
if (usingDefinition.IsMethodParameter)
{
var usingDefinitionHash = usingDefinition.GetHashCode();
var methodParameterIndex = methodParameterIndices[usingDefinitionHash];
ilGenerator.Emit(OpCodes.Ldarg_0);
ilGenerator.Emit(OpCodes.Ldfld, MethodParameterFields[methodParameterIndex - 1]);
}
else if (usingDefinition.IsControllerProperty)
{
ilGenerator.Emit(OpCodes.Ldarg_0);
ilGenerator.Emit(OpCodes.Ldfld, ParentField);
ilGenerator.Emit(OpCodes.Callvirt,
typeof(Controller).GetProperty(usingDefinition.ControllerPropertyName).GetGetMethod());
}
else if (usingDefinition is FluentActionUsingPropertyDefinition)
{
var propertyName = ((FluentActionUsingPropertyDefinition)usingDefinition).PropertyName;
var parentType = fluentActionDefinition.ParentType ?? typeof(Controller);
var property = parentType.GetProperty(propertyName);
if (property == null)
{
throw new Exception($"Could not find property {propertyName} on type {parentType.FullName}.");
}
var propertyGetMethod = property.GetGetMethod();
if (propertyGetMethod == null)
{
throw new Exception($"Missing public get method on property {propertyName} on type {parentType.FullName}.");
}
ilGenerator.Emit(OpCodes.Ldarg_0);
ilGenerator.Emit(OpCodes.Ldfld, ParentField);
ilGenerator.Emit(OpCodes.Callvirt, propertyGetMethod);
}
else if (usingDefinition is FluentActionUsingParentDefinition)
{
ilGenerator.Emit(OpCodes.Ldarg_0);
ilGenerator.Emit(OpCodes.Ldfld, ParentField);
}
else if (usingDefinition is FluentActionUsingResultDefinition)
{
FieldBuilder resultFieldToLoad;
if (handlerInStateIndex > 0)
{
resultFieldToLoad = state.Handlers[handlerInStateIndex - 1].ResultField;
}
else
{
resultFieldToLoad = States[stateIndex - 1].ResultField;
}
ilGenerator.Emit(OpCodes.Ldarg_0);
ilGenerator.Emit(OpCodes.Ldfld, resultFieldToLoad);
if (resultFieldToLoad.FieldType.IsValueType)
{
ilGenerator.Emit(OpCodes.Box, resultFieldToLoad.FieldType);
}
}
else
{
throw new Exception($"Got unknown using definition: {usingDefinition.GetType()}");
}
}
private void DefineStates(FluentActionDefinition fluentActionDefinition)
{
var handlersPerState = fluentActionDefinition.Handlers
.Divide(handler => handler.Async)
.Select(handlers => handlers.ToArray())
.ToArray();
States = new StateMachineState[handlersPerState.Length];
for (var stateIndex = 0; stateIndex < handlersPerState.Length; stateIndex++)
{
var handlersInState = handlersPerState[stateIndex];
var state = new StateMachineState
{
Handlers = new StateMachineStateHandler[handlersInState.Length]
};
for (var handlerIndex = 0; handlerIndex < handlersInState.Length; handlerIndex++)
{
var handlerDefinition = handlersInState[handlerIndex];
state.Handlers[handlerIndex] = new StateMachineStateHandler
{
Definition = handlerDefinition
};
if (handlerDefinition.Type == FluentActionHandlerType.Func)
{
state.Handlers[handlerIndex].DelegateField = Type.DefineField(
$"State{stateIndex}Handler{handlerIndex}Delegate",
BuilderHelper.GetDelegateType(handlerDefinition),
FieldAttributes.Public);
state.Handlers[handlerIndex].ResultField = Type.DefineField(
$"State{stateIndex}Handler{handlerIndex}Result",
handlerDefinition.ReturnType,
FieldAttributes.Public);
}
else if (handlerDefinition.Type == FluentActionHandlerType.Action)
{
state.Handlers[handlerIndex].DelegateField = Type.DefineField(
$"State{stateIndex}Handler{handlerIndex}Delegate",
BuilderHelper.GetDelegateType(handlerDefinition),
FieldAttributes.Public);
}
else if (
handlerDefinition.Type == FluentActionHandlerType.View ||
handlerDefinition.Type == FluentActionHandlerType.PartialView ||
handlerDefinition.Type == FluentActionHandlerType.ViewComponent)
{
state.Handlers[handlerIndex].ResultField = Type.DefineField(
$"State{stateIndex}Handler{handlerIndex}Result",
handlerDefinition.ReturnType,
FieldAttributes.Public);
}
}
var lastHandlerInState = handlersInState.Last();
if (lastHandlerInState.Type == FluentActionHandlerType.Func)
{
state.ResultType = lastHandlerInState.ReturnType;
state.ResultField = Type.DefineField(
$"State{stateIndex}ReturnType",
state.ResultType,
FieldAttributes.Public);
state.TaskAwaiterType = typeof(TaskAwaiter <>)
.MakeGenericType(lastHandlerInState.ReturnType);
state.TaskAwaiterField = Type.DefineField(
$"State{stateIndex}Awaiter",
state.TaskAwaiterType,
FieldAttributes.Public);
state.WaitingField = Type.DefineField(
$"State{stateIndex}WaitingFlag",
typeof(bool),
FieldAttributes.Public);
}
else if (lastHandlerInState.Type == FluentActionHandlerType.Action)
{
state.ResultType = lastHandlerInState.ReturnType;
// state.ResultField is not used since an Action returns void
state.TaskAwaiterType = typeof(TaskAwaiter);
state.TaskAwaiterField = Type.DefineField(
$"State{stateIndex}Awaiter",
state.TaskAwaiterType,
FieldAttributes.Public);
state.WaitingField = Type.DefineField(
$"State{stateIndex}WaitingFlag",
typeof(bool),
FieldAttributes.Public);
}
else if (lastHandlerInState.Type == FluentActionHandlerType.View ||
lastHandlerInState.Type == FluentActionHandlerType.PartialView ||
lastHandlerInState.Type == FluentActionHandlerType.ViewComponent)
{
state.ResultType = lastHandlerInState.ReturnType;
state.ResultField = Type.DefineField(
$"State{stateIndex}ReturnType",
state.ResultType,
FieldAttributes.Public);
}
States[stateIndex] = state;
}
}